A Foothill Transit bus rammed into a medical building in West Covina on Wednesday, leading police to shut down a section of Sunset Avenue.

Foothill Transit spokeswoman Felicia Friesema said the driver was about to start his route and the bus was empty.

The bus driver was not injured, according to Assistant Fire Chief Brian McDermott of the West Covina Fire Department. He said part of the building will be red-tagged.

West Covina police said no one in the building was hurt.

The accident occurred in the 700 block of South Sunset Avenue around 9:20 a.m.

Officer Dave Sifling said the bus was traveling east on Cameron Avenue, made a left turn on Sunset Avenue, lost control and continued turning. He said the bus crossed over the center divider into the southbound lanes and crashed into the building.

Police closed the southbound lanes of Sunset Avenue between West Covina Parkway and Cameron Avenue because of the crash.

Ruby Gonzales started working for the company in 1991. Since then she has written about cities, school districts, crimes, cold cases, courts, the San Gabriel River, local history, anime, insects, forensics and the early days of the Internet when people still referred to it as the "information superhighway." Her current beat includes breaking news, crimes and courts for the San Gabriel Valley Tribune, Pasadena Star News and Whittier Daily News. When not in crime reporter mode, she frequents the remaining bookstores in the San Gabriel Valley, haunts craft stores or gets dragged to eateries by a relative who is a foodie.